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The impact of network inhomogeneities on contagion and system stability

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  • Hübsch, Arnd
  • Walther, Ursula
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    Abstract

    This work extends the contagion model introduced by Nier et al. (2007) to inhomogeneous networks. We preserve the convenient description of a financial system by a sparsely parameterized random graph but add several relevant inhomogeneities, namely well-connected banks, financial institutions with disproportionately large interbank assets, and big banks focusing on wholesale and retail customers. These extensions significantly enhance the model's generality as they reflect inhomogeneities as found in reality with a potentially decisive impact on system stability. Whereas well-connected banks and big retail banks have only a surprisingly modest impact, we find a significantly enhanced contagion risk in networks containing institutions with disproportionately large interbank assets. Moreover, we show that these effects can be partly compensated by a suitable regulatory response which demands additional net worth buffers for banks with above average volume of interbank assets. The stabilising effect is most notably achieved by a pure redistribution of equity capital without increasing its total amount. --

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    Bibliographic Info

    Paper provided by Frankfurt School of Finance and Management, Centre for Practical Quantitative Finance (CPQF) in its series CPQF Working Paper Series with number 32.

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    Date of creation: 2012
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    Handle: RePEc:zbw:cpqfwp:32

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    Keywords: capital buffers; contagion; contagious defaults; inhomogeneities; network models; financial system stability;

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    1. Herrmann-Pillath, Carsten, 2010. "Entropy, function and evolution: naturalizing Peircian semiosis," Frankfurt School - Working Paper Series 134, Frankfurt School of Finance and Management.
    2. Bannier, Christina E., 2007. "Heterogeneous multiple bank financing: does it reduce inefficient credit-renegotation incidences?," Frankfurt School - Working Paper Series 83, Frankfurt School of Finance and Management.
    3. Hankir, Yassin & Rauch, Christian & Umber, Marc P., 2009. "It's the market power, stupid! Stock return patterns in international bank M&A," Frankfurt School - Working Paper Series 129, Frankfurt School of Finance and Management.
    4. Christina E. Bannier, 2010. "Is there a Holdup Benefit in Heterogeneous Multiple Bank Financing?," Journal of Institutional and Theoretical Economics (JITE), Mohr Siebeck, Tübingen, vol. 166(4), pages 641-661, December.
    5. Roßbach, Peter, 2009. "Die Rolle des Internets als Informationsbeschaffungsmedium in Banken," Frankfurt School - Working Paper Series 120, Frankfurt School of Finance and Management.
    6. Carsten Herrmann-Pillath, 2010. "A neurolinguistic approach to performativity in economics," Journal of Economic Methodology, Taylor & Francis Journals, vol. 17(3), pages 241-260.
    7. Libman, Alexander, 2010. "Constitutions, regulations, and taxes: Contradictions of different aspects of decentralization," Frankfurt School - Working Paper Series 138, Frankfurt School of Finance and Management.
    8. Wollersheim, Jutta & Barthel, Erich, 2008. "Kulturunterschiede bei Mergers & Acquisitions: Entwicklung eines Konzeptes zur Durchführung einer Cultural Due Diligence," Frankfurt School - Working Paper Series 94, Frankfurt School of Finance and Management.
    9. Herrmann-Pillath, Carsten, 2009. "Kulturelle Hybridisierung und Wirtschaftstransformation in China," Frankfurt School - Working Paper Series 115, Frankfurt School of Finance and Management.
    10. Herrmann-Pillath, Carsten, 2008. "The naturalistic turn in economics: implications for the theory of finance," Frankfurt School - Working Paper Series 105, Frankfurt School of Finance and Management.
    11. Hirsch, Christian & Bannier, Christina E., 2007. "The economics of rating watchlists: Evidence from rating changes," CFS Working Paper Series 2008/02, Center for Financial Studies (CFS).
    12. Christian Upper, 2007. "Using counterfactual simulations to assess the danger of contagion in interbank markets," BIS Working Papers 234, Bank for International Settlements.
    13. Herrmann-Pillath, Carsten & Libman, Alexander & Xiaofan, Yu, 2010. "State and market integration in China: A spatial econometrics approach to 'local protectionism'," Frankfurt School - Working Paper Series 137, Frankfurt School of Finance and Management.
    14. Bannier, Christina E. & Grote, Michael H., 2008. "Equity gap? - Which equity gap? On the financing structure of Germany's Mittelstand," Frankfurt School - Working Paper Series 106, Frankfurt School of Finance and Management.
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